SSC Stenographer 2026 PYQ — Question 180

In the following question, some of the words in the passage have been left out. Read the passage carefully and choose the correct answer to each question out of the four alternatives and fill in the blanks.
Aeroplane mode is a built-in smartphone feature that (1)_____ all cellular, wireless, and Bluetooth signals. When passengers leave their cellular devices active during air travel, these devices continuously scan for network connections at full intensity. This intense scanning emits strong electromagnetic interference that can (2)_____ the aircraft's critical communication and navigation systems. Pilots frequently report hearing a distinct buzzing sound in their headsets. This sound may affect the clarity of communication during (3)_____ flight phases, when pilots rely heavily on instructions from the ground support team. These sounds can mask urgent radio commands from air traffic control. Moreover, cumulative signals from dozens of active devices can compromise the accuracy of flight deck instruments, such as altimeters and radar. While modern aircraft are engineered with advanced (4)_____, the potential for technology to fail under unexpected signal interference remains a reality. Compliance with aeroplane mode is not something to be taken lightly by the passengers. It is a vital safety (5)_____ that ensures pilots maintain a clear, uninterrupted line of communication with ground support, ensuring a safe journey for everyone on board.
What should come in blank 5?